BIO 101 Lecture Notes - Lecture 4: Middle Lamella, Cell Membrane, Fallopian Tube
1 Oct 2016
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Document Summary
The cell theory states that every living thing is made of one or more cells. Most cells very small, ranging from 1-100 micrometers in diameter. Cells need to exchange nutrients (o2 and food) and wastes (co2) with the environment. When a cell gets too big, it divides. Eukaryotic cells are larger and more complex than prokaryotic cells. They include a variety of membrane-enclosed organelles that preform specific functions within the cell. Prokaryotic cells mean before the nucleus and do not have one. They contain structures like pili, flagella, and are responsible for secreting biofilm, which allows bacteria to adhere to other surfaces. Each of the cells, eukaryotic and prokaryotic, has specific features, and differs in regards to cell walls, chloroplasts, plastids, central vacuoles, and centrioles. Cell walls: stiff outer coatings composed of polysaccharides such as cellulose and chitin, may have multiple layers (primary, secondary, and middle lamella**, found on the outside of plants, bacteria, and fungi.
